Influence of elevated temperature on starch hydrolysis by enterotoxin-positive and enterotoxin-negative strains of Clostridium perfringens type A.
نویسندگان
چکیده
Enterotoxin-positive (Ent+) and enterotoxin-negative (Ent-) strains of Clostridium perfringens were cultured in Duncan-Strong sporulation medium containing starch at 37 and 46 degrees C. At 37 degrees C, all strains degraded starch and sporulated well. However, only Ent- strains could hydrolyze starch, grow extensively, and sporulate at 46 degrees C. Growth, sporulation, and starch hydrolysis by Ent+ strains at 46 degrees C were equivalent to those obtained at 37 degrees C when alpha-amylase was added to the cultures during growth. The total amount of extracellular plus intracellular amylase in cultures of Ent+ strains was significantly less in cells incubated at 46 degrees C than in cells incubated at 37 degrees C. These results contradict an earlier report that Ent+ strains cannot sporulate well near their optimal growth temperature (R. G. Labbe and C. L. Duncan, Can. J. Microbiol. 20:1493-1501, 1974) and suggest that synthesis of alpha-amylase in Ent+ strains is regulated by temperature.
منابع مشابه
García - Alvarado , M A Rodriguez and R G Labbé perfringens type A . enterotoxin - negative strains of Clostridium hydrolysis by enterotoxin - positive and Influence of elevated temperature on starch
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ورودعنوان ژورنال:
- Applied and environmental microbiology
دوره 58 1 شماره
صفحات -
تاریخ انتشار 1992